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    What test should be used to compare nominal data between 5 groups

    Dear All, I am a surgeon trying to investigate how indications for a device has changed over 5 years. I have the following data set for patients; I want to find out for each indication if there is a trend or a statistically significant relationship over the years. What is the best statistical...
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    Sample size calculation

    Dear All, I am a vascular surgeon planning a research project. I need some advice regarding the sample size calculation. I am looking at the same group of patients pre and post-procedure looking for a change in the diameter of their main blood vessel at 2 different points. We have some data...